X10 Appliance and Lamp Modules hold up pretty well ... but these are only rated to 300 Watts, so I can't demand much power from them. The main load is carried by the X10 Super Sockets (since they can take a full 1800 Watts) and one of those will go bad about once/week during the holiday season. The failure is pretty obvious as it no longer responds to commands. Also, there is a mechanical relay inside of these that makes a single "click" when toggled - when they break, there are about a dozen clicks in quick succession - sounds like a buzzing noise. No way to take these apart, so I just replace with another one.